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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a5cc77948c79fa26aea72cdafb12daa65d1291cc377693b223f1a4a7a9f101' 
  AND token = 'tdASRrMmMlG4W7JPXJGJNO0Y1akqx1e7zUprqrogfIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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