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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7e686abbe87c8c9e67a3023d6e81ae6e3a22a810b6f2da1f8d6330ba010dd6' 
  AND token = 'Lv2lGv68Ou4R/kolVbbDWDUUhTgxF7pzXPOMb0Hc4Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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