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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1cf611ad4b78a73aa769807a9f4291abd00e5b8752ff3fe56cc2a2a16aa0bd' 
  AND token = 'AjpoR2VbyLTTiwVU4c0hvvpUHEIJU5cueV0zJVX7obA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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