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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3dcbec66c604e6cd618d7a334363268c1d214fcf7e94d9459a02ed66253e654' 
  AND token = 'M90nZXGffPClk9NRQ8ikQ5cNw0UUh+qh5mbpHb3ybNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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