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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e581b152a2ab7f6c0f50720613dbe63fa3a76e4f5663df0a3b0aff1e277f1c6' 
  AND token = 'lrb/uUdqZrVtkHcZ6Uq6YeF7oP2q/S0N76En4K8Blyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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