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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f13bc66c4fcd481309c9205722136a59b1efbf4ca71802db5b30150e7b9393' 
  AND token = 'MAQ9+ZYmfTAlc5TaTnxietszjBjbIOeutD5Asd7udUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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