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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc113c1ecdabab8b87ffd47f9546191b9a0365d5818a6bc85b02967abf42d28e' 
  AND token = 'xeUNUg3foWb2+ICqrEyuKRpr3EIVOMGjE0LiHVXREXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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