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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa1d27d06fbb1428999b71ff3ea1534267374373fa7c15fd754d37b8d1a8de1' 
  AND token = 'EfTh8zdmT7g29t5kilkpYq2JP4Dy0Ekb47YkR02AmJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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