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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e18e28926e6ea1514aa4f9f31b047cde9f56b4430dff9cf40e043b6e402799' 
  AND token = 'DpZX+YmRkZteLxydNYk7tklTHl3xvzEoXcb3/BDgpnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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