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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00758804497baf2712143a4f5204e13aa247f6062fd84f600904df8a2432603' 
  AND token = 'bRK3Ktdnuq+YmmnmcVGUQMyyEbk9EtdTSexsIPQZMe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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