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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f1dacccab711e0c3a77ae7359cbed3001bf02d0e65edbe13f1c0f19c0abf6b' 
  AND token = 'NX+Z9qf3G+ht9ELoOfoDD9bklAYF6fSk5x6s0mGwxT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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