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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b55d4166b6d2efb7a9c5b69d5da8a68c7299b9c2e72ab0cc8b1514ea7c7a4f' 
  AND token = 'KNgF/ra+P2AdB4fpLfFUtNLE9a8MfTP+FqtSOWiTo5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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