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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0c82daf1b6cbff9851c8d73743f0081375e4298ccd41f3bf3b43dd1c36c0db' 
  AND token = 'E9yMuuKBFrrdwd1PdeYbgJjZp24R7JbPqQulHk/5594=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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