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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8062ff835e61620097ddef2b5a16ec9f7eb10221596c2b9d49610b4ae8ce6e1d' 
  AND token = 'J00YHnxMDpk9axBzEglbYsYH+RokDczR4RdB6EmjQWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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