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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccbac14256dfbf2dd2a033f63a8484612177f0e0148dbc9fd90b5cda92f3346f' 
  AND token = 'wOQ7/nDh38xOHGmc0cwesAGg93ZQFF8Xluw78zKLW4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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