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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5305914f67a094a3bff13c756ff39d9e1e12a4b4076f1641138e9362f6d300af' 
  AND token = 'OhBS5YPYcViZtT9eLtJt6g/NxWTKS9/nA1TZitzpmOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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