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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702dcf75b8ec5e4d7c8a8134d6ede19cf2747af22916bbb5970f06a15cf37eea' 
  AND token = 'xl7NUlJYhUkxbBmLdI7KcQatUclnKZ6/gQFcF+8KtO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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