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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0629f830f9a01d0a56b7c4c0dc05af8332bab1e43a92433c66ce87be805d017b' 
  AND token = 'rzac0eLKDwkHXOBcFvQ3AazFNQ6t12/rstCmyNIQyBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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