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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ac19e78f5b8a432486b3d4c253d769780b6a6443bd1468d4ea75711650249d' 
  AND token = 'oj7L5aZ8uQu0Syy3Z28CvXwmqzmFEaPfHRCu3AYbkgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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