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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc91240ec3eaf3f0314adc45bd8d6d7596f4ee5544b21c29bc69bac98425faea' 
  AND token = 'UeIz/XyzkFCCLQUIpCD32SWfW1wgC9pV5de8uNwze+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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