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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd68bff0d9eeb8eaf1a5a9279f8167868ab37c230bf3e06b56fa160d22d42b4' 
  AND token = 'zl20VDhEiFwy2zrwLLb7JTlrvVKjV6l1dttUsXWiFjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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