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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db52562ef3de1139002ef6da8329403c4b4d80f815bd6c1408df0f482b95c0bd' 
  AND token = 'MuXCWJtrTeSb8wBHpH8QCMFHKSI714MmkT/cCpwmzKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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