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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6f8e566781522f575d46b3b45f59e6d50768f5d6d3b373b2aaa8a8209f16cb' 
  AND token = '0Xlgfbg37DHrllGaax/mRE45cF/5QJQA0gV+xQyzqIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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