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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97abb222cc2d69df2139a5658a69b93173a3d63a2be1766713cd6074c219cf9b' 
  AND token = 'qEvgMI8fgpHpHMH7KLNw6ddp1t1DjK0qmwDJFnblne0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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