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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8bcafc7e7e8d4ea966f05d382672e0695477491a8ed8ea39ff3b3b8e81e2c7' 
  AND token = 'QZNiJdjmNFbcJ6Q3ReFlmVlqBcj14eRRqgCr7H4SMbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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