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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5fb9d6beebeaef51b42165e87953a55d7f695014dc2b32d938eeb4458dfb85' 
  AND token = 'ISM4KHiZTu6HDv4Mb14u8Squ7uLymmg2u/fcyimyR2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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