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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f82d05eec0297881c2c5994aa842c51cc2de3ac371d764d6a7bc21085ec65f' 
  AND token = '2cl3bQTncs3zaYTos/Lzhxo51JtCfovIc2AwLkAC0Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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