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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae79feb35cc3b9a5a7ceeb7bcfc687d530b12b1ac608a3bd2e4ec344caa69646' 
  AND token = 'c9ynDkf9w+NFRoPDI9pr0V2X5vgPR3xiI6qy3Dp9bbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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