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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccfb1d89925322b31d4c5eac3efc0cc4f3d9842cf177dcf6c2c3dd0d7b82b305' 
  AND token = 'gwh2dKGQ5ys79kbbYgACJVJzu8XUPMVeQNPkbTRGWqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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