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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58cdef8c85dc449dd832d895b534151ab73be28be05a75cf0ca99624e09967a' 
  AND token = 'fy4yb4xAjWYbbkY5OA0XUQwxtIfip2uyu1zlMa7Coe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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