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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c473c598c914692360dc530369e7cbfbcbff2054d37e7cd8dc97e4181b6fe1' 
  AND token = 'cjDjv05cxH7ivRM0vaObOE9Cz0uKLMlaXgoFWFWHHAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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