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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfb90d8096e71835ab5ba83a765e124d9a264e5968b0ca6a87c00521b38a4ce' 
  AND token = 'uNbSERZ0N1UZy1w48uNcMAARu8kA9Wup7BHjpby5fwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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