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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c1543b4e04fa7a8de7f87f59eff1ec35b6638c4bb30cbe9f3cb8356e66af98' 
  AND token = 'GCLFPOuZskU6L94MmumzF7Y8GRnA868Qhb8Ew5qoDHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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