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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f6ab1eb43608a9b555e2fec3fd91b2668c4274988a44ad281c9b5d18f527ff' 
  AND token = 'iKHjJPseV6JUhkXUxCNn4rUXFJcqI+ifRN98cJu3a1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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