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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834f67c503dfa0c67314ba7f1ac0bcf5edeaff3edaba7fc066e1dcc4c466e8e7' 
  AND token = 'JWnkHQdWrgIb38Cd8CqOPyjy+ykHq7ti9XI9oAJcvM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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