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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e38380227a5f44ca51f1c71d129fc3663599554818f0a093c0c74b2e8cbeb4' 
  AND token = '6z1+JxeEm/jIhq8/Kjk2WV4mef7/0ur3/fLmV/j6CTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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