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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ae5307c84933f4886a020531fa317fcf9186666db0bc55aae18c8667c4146d' 
  AND token = 'B3QthMCro38K6Z3syNBUy1pgmOmzGHWejHfeniwlW4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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