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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272fffbd9ae3309ccab4707a24ff1c9f8a553ac5bbd042db4b55b4aa0a6504c5' 
  AND token = 'qQXVu0xpuhExtpU51DzgAG0byfBR0n8qVsUJvY4S6xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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