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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd92854e2f958d0958ea80a72e471e8d3c27cdd41945637379ecd8236de0cbbf' 
  AND token = 'B7NhLnXcbsq26Y9nF7p//D0unLT/NXb7OMixIrdqGog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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