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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7aea80d1c3ad0b86d1044ba6f15f6c7e9275228bdf50c4534be36aa28ea8fdf' 
  AND token = 'WgXTZpvVMw9V/OuTqANYdohTzqhYTMeARO68n9ecU84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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