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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ffe0cdc8e7ea81527c296cad389cb7072297433113ceee58c7f3ed3ec09bfc' 
  AND token = '/nDLJ30Ksms7MzNzKFED26t2xjwo3dFrzC6V6Q25PUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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