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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d7c655222acd08db8715aaf18eb30662f71ad3068889a6fe340ff2052f2ef7' 
  AND token = 'Fl0gCzCW8Ntfn+EfMHuDlfDQ6ZV/gU9aCCFkgngQWI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}