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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297ddaddf9c1790ac9fb215c134e4b7918c8d6fefc404bce12cedcd5942a7ecd' 
  AND token = 'EFFYDSk066Wk+Lrol3IRIlM/fCJ78IRaUuw+z1tivJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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