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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fef44d91e626ea87b4ce637c753c0a1c60f7e5783ff1ae901f3cc9372453af1' 
  AND token = 'QJrp/UTPKZ3xlKijKcMTuwBwgmIq6uE1TqlRapbG6GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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