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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300b347824f5b53fb901f619a3cdd6b8e1323b30a4de2d1433c04dbab3b59166' 
  AND token = '5ZLrN6wxoJCEE+jBjR1usSDTfZp4fyLPzuMBLwNWkww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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