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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc213c0bc1e1f01f3cdd0c7e7201122f40797ae0286faab9ff73cedfd70b7fd' 
  AND token = 'UV3NPZ8sJBbCxCujB4TsJLkuLwkGM3LoPqygiWz679w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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