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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd932d6bbea79900f4644c3ec561e603fd75fb5d00614106be887fb71a6858e' 
  AND token = '13dkVso5iPU/9pYvMfWLsf61JY4M2Rb5oH/PZBjQYlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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