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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515a2a5b44e66a9df0ae83101722cf2128d1ce77e2f1cfcd1d88b09079afacd3' 
  AND token = 'Yilkzvoau4E4QAT2LfOVrvn9l9iDovfaUVSC8edc+fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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