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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7961eee8d858499d2e02533f86a1950ad2df27b40b547a4535e106dbfe9d112b' 
  AND token = 'Ykg4qOgvg9FGMlyJlRRK++ezgbmy2DXXUuPM1WIBees=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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