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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d571daadc55e5d1b5160e6b356f4122b4e7c3cb29b06e96ec2d9b8395d87253' 
  AND token = 'DAaFat1yh2OYiAlsgDb5W72dnLWUnAq8YLiA9tBNAjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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