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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c35d44ad415a8b6df0d5d39fc89dd8903f053c90968985ee2d6f6448b622ad9' 
  AND token = 'oe+fMWQCcpq4Wa1EvRS7B3XJgUn4pIIvCSc6ggSodao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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