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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f918bc3330c5ca0bf3fe5b474b42759c08064fdf32406a73348d261f6c549274' 
  AND token = 'RPuyII3pTA03QyGIOKEHc9Y+gVUtpixLfEQiL40Ty6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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