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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02b84d0e502382ed8ce47ac27d8d04cac65b6f64ef870197eef2de677e96819' 
  AND token = 'rfYRdVeTfGEh+/mHaxx+VZMOM29RATWFZxdaAekk12U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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