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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e382ca955029ca79274cc54c24b1dca6c25d3e50520358e4f28ca5c2ae1d6aff' 
  AND token = 'lBgfZx6XHfSoGeREoQP1Bc1wK4PKZzDZXhqi8BsGqFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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