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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cadb175100df60f31721df43fcaa7f353e601d8ba2f0e52346c12e88b51ab5ab' 
  AND token = 'D9cpVYzEuAAPFyc1E03QIFxy8sBPSYTgewLQBjbOS8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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