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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61118505a124d58154b82a6e72dc0a982d7cdb8ccfdac6e7489bf55006f7df0f' 
  AND token = 'hAADSz8Yd3Hi45O3oFmbkjQ0G/e+wMTAr02AqH2rvuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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