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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94c7b230dc489536e80c62b63648090085b74d8cef37e59046b819386c71a7a' 
  AND token = 'DfBn3vq9OeD0XbI90tU5XxAdr/Rp3JERBjSpeqxevTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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