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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768e20edd58582267181f4f59c2a6eff9fecadd3b2f1de7499e79b4bff12981e' 
  AND token = 'gHWFvp/c2nPdKTj5/BGp5tLQAEpQsYNsvmUFncvi79U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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