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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59030875ba1f43917ac701c8ae2c8b4c9afbfcd92e343a32954da8b77a85230' 
  AND token = 'CutZUcVipFoInR6nqmW8im0mumH8Enn3g4HV0TXIiss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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