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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce53df52ad9dc62ea7946a467020c210989b2f4f3f3b9aaa4ad6ced26342012' 
  AND token = 'OV7NOwL6lRRGDLfLgsaDlAthvUlibkY6i8wFn2Er+60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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